User Guide

Standards for audio jacks
Not all 3.5-mm audio jacks are made to the same standard. There are two audio jack standards:
 Cellular Telecommunications Industry Association (CTIA), and
 Open Mobile Terminal Platform (OMTP).
If you use an OMTP headset, you’ll probably experience audio or chat issues. However, if your
headset or earbuds use the OMTP standard, you can purchase an adapter to convert the device to
CTIA. These adapters are available at many electronic retail stores.
The following images show the differences in the CTIA and OMTP standards. The CTIA
standard has the microphone section of the jack closer to the end of the cable while the OMTP
standard has the ground section of the jack closer to the end of the cable.
CTIA:
1. Microphone
2. Ground
3. Right audio channel